1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.internal.xjc.util; 27 28import java.text.ParseException; 29import java.util.regex.Matcher; 30import java.util.regex.Pattern; 31 32/** 33 * Utility class to parse a string 34 * 35 * @author Kohsuke Kawaguchi 36 */ 37public final class StringCutter { 38 private final String original; 39 private String s; 40 private boolean ignoreWhitespace; 41 42 public StringCutter(String s, boolean ignoreWhitespace) { 43 this.s = this.original = s; 44 this.ignoreWhitespace = ignoreWhitespace; 45 } 46 47 public void skip(String regexp) throws ParseException { 48 next(regexp); 49 } 50 51 public String next(String regexp) throws ParseException { 52 trim(); 53 Pattern p = Pattern.compile(regexp); 54 Matcher m = p.matcher(s); 55 if(m.lookingAt()) { 56 String r = m.group(); 57 s = s.substring(r.length()); 58 trim(); 59 return r; 60 } else 61 throw error(); 62 } 63 64 private ParseException error() { 65 return new ParseException(original,original.length()-s.length()); 66 } 67 68 public String until(String regexp) throws ParseException { 69 Pattern p = Pattern.compile(regexp); 70 Matcher m = p.matcher(s); 71 if(m.find()) { 72 String r = s.substring(0,m.start()); 73 s = s.substring(m.start()); 74 if(ignoreWhitespace) 75 r = r.trim(); 76 return r; 77 } else { 78 // return everything left 79 String r = s; 80 s = ""; 81 return r; 82 } 83 } 84 85 public char peek() { 86 return s.charAt(0); 87 } 88 89 private void trim() { 90 if(ignoreWhitespace) 91 s = s.trim(); 92 } 93 94 public int length() { 95 return s.length(); 96 } 97} 98